n,d,K,*x=$<.read.split.map &:to_i
m=[0,0,0]
x.each_with_index{|a,j|
  x[j+1..[j+d,n].min].each_with_index{|b|
    v=b-a
    v>m[0]&&m=[v,j,k]
  }
}
m[0]<1?p(0):puts(m[0]*K,m[1,2]*' ')